인버터 주도 계통 안정도의 그리드 포밍 제어 영향 연구 = A study on the influence of grid forming control on inverter-driven grid stability

 

인버터 주도 계통 안정도의 그리드 포밍 제어 영향 연구 = A study on the influence of grid forming control on inverter-driven grid stability GwangwoonUniversity GraduateSchoolof ElectricalEngineering KimDongWhi

ABSTRACT Recently, as new and renewable power sources penetrate into the system, an increase in IBR (Inverter Based Resource) and a decrease in synchronous generators are occurring. In this paper, the system operation using GFM (Grid Forming) was studied as a solution. The comparison study has been performed with the existing GFL (Grid Following) and synchronous generator in terms of the reduction in system inertia and robustness in the grid. This paper proposes a method for calculating the optimal capacity of GFM to ensure system stability and apply the novel IBR protection system (FRT, Black Start). In the case of GFM optimal capacity calculation, a renewable power source system network is modeled and various (load fluctuations, ground faults, generator trip) simulations are conducted with the existing synchronous generator, GFL, and GFM for the power system stability analysis. The formulation was performed by measuring Nadir with Monte-Carlo simulation results using the system inertia, GFL & GFM ratio, and renewable energy penetration rate as parameters. With the result, it was possible to know frequency nadir and the optimal GFM capacity required depending on system situation. The fault current limiter proposed has been verified its performance on the grid-connected photovoltaic IBR system. In addition, a stand-alone black start of GFM was proposed and the contribution of stable recovery through synchronization control was confirmed.

ORIGINAL LINK : https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=b0edd4d81bb1ee59ffe0bdc3ef48d419&keyword=inverter%20grid%20forming